My best advice is to stay to 1 or 2 at the very most; taking more won't get you feeling higher, just more "sped out" which isn't euphoric IMO, just annoying and frustrating.
Basic dosing questions belong in Basic Drug Discussion, so I'll go ahead and close this thread. Please check out that sub-section in the future, there's lots of pre-existing threads there that are just like this one.
Finally, welcome to Bluelight! Please stop by New Member Introductions and tell us some about yourself.